There are many causes of red, swollen and watery eyes, such as viral conjunctivitis, keratitis, corneal ulcers, trachoma and so on. 1. Viral conjunctivitis: viral conjunctivitis has many symptoms, mainly showing redness, swelling, conjunctival congestion, foreign body sensation, pain, watery or plasma-like secretion, thus showing red, swollen and tearing eyes. 2. Keratitis: Pathogenic microbial infection or corneal foreign body can induce keratitis, resulting in foreign body sensation, redness, swelling, pain, tearing and other phenomena. 3. Corneal ulcers: typical symptoms of corneal ulcers are congestion, redness, swelling, tearing, etc., and may even be accompanied by increased secretion, redness and swelling of the pharynx. 4. trachoma: trachoma is a chronic infectious inflammatory disease, can show a foreign body sensation, eye redness, tearing and other phenomena, part of the slow and may also be accompanied by lid inversion, ptosis, eyeball adhesion and other phenomena. There are many other causes of red and swollen eyes and tears, after the symptoms, it is recommended to go to the hospital in a timely manner to improve the examination, follow the doctor’s instructions to take standardized treatment.